The phrase "frequent visitor" refers to someone who repeatedly goes to the same place, like a store, restaurant, or website, often enough that they are considered a regular customer or user. Full definition
The patron respondents in our opt - in sample were frequent visitors of both their library's physical branch and website. (libraries.pewinternet.org)
I was her most frequent visitor as my husband traveled frequently at the time. (bookbrowse.com)
The investment in tourist facilities in various world and European cities over the last decade has meant that many native people have now become frequent visitors to the cities within their own borders. (travelsoon.com)